<template>
    <div class="list" ref="wrapper">
      <div>
        <div class="area">
            <div class="title border-topbottom">当前城市</div>
            <div class="button-list">
                <div class="button-wrapper">
                    <div class="button">{{this.currentCity}}</div>
                </div>
            </div>
        </div>
        <div class="area">
            <div class="title border-topbottom">热门城市</div>
            <div class="button-list">
                <div 
                  class="button-wrapper" 
                  v-for="item of hot" 
                  :key="item.id"
                  @click="handleCityClick(item.name)"
                >
                    <div class="button">{{item.name}}</div>
                </div>
            </div>
        </div>
        <div 
          class="area" 
          v-for="(item,key) of cities" 
          :key="key"
          :ref="key"
        >
            <div class="title">{{key}}</div>
            <div class="item-list">
                <div 
                  class="item border-bottom" 
                  v-for="inneritem of item"
                  :key="inneritem.id"
                   @click="handleCityClick(inneritem.name)"
                >
                   {{inneritem.name}}
                </div>
            </div>
        </div>
      </div>
    </div>
</template>

<script>
import BScroll from 'better-scroll'
import {mapState,mapMutations} from 'vuex'
export default {
    name:'CityList',
    props:{
        hot:Array,
        cities:Object,
        letter:String
    },
    computed:{
        ...mapState({
            currentCity:'city',//把city改了个名字(对象用法)
        })
    },
    methods:{
        handleCityClick(city){
            // this.$store.commit('changeCity',city);
            this.changeCity(city);//在设置mapMutations的情况下可以这样写
            this.$router.push('/')
        },
        ...mapMutations(['changeCity'])
    },
    watch:{
        letter(){
            if(this.letter){
                const element=this.$refs[this.letter][0];
                this.scroll.scrollToElement(element)
            }
        }
    },
    mounted(){
        this.scroll=new BScroll(this.$refs.wrapper)
    },
}
</script>

<style scoped>
.list{
    overflow: hidden;
    position: absolute;
    top:1.58rem;
    left:0;
    right: 0;
    bottom: 0;
}
.title{
    line-height: 0.54rem;
    background: #eee;
    padding-left:0.2rem;
    color:#666;
    font-size:0.26rem;
}
.border-topbottom:before,.border-topbottom:after{
   border-color: #777;
}
.button-list{
    padding:0.1rem 0.6rem 0.1rem 0.1rem;
    overflow: hidden;
}
.button-wrapper{
    float: left;
    width:33.33%;
}
.button{
    padding:0.1rem 0;
    margin:0.1rem;
    text-align: center;
    border:0.02rem solid #ccc;
    border-radius: 0.06rem;
}
.item{
    line-height: 0.54rem;
    padding-left: 0.2rem;
}
.border-bottom:before{
   border-color: #777;
}
</style>